html,body {
    margin: 0%;
}
.wrapper {
    height: 100%;
    width: 100%;
    display: flex;

    /* Direction of the items, can be row or column */
    flex-direction: column;
    flex-wrap: nowrap;
}

header,
footer {
    height: 30px;
    flex-shrink: 0;
    background-color: bisque;
}

main {
    flex-grow: 1;
    overflow: auto;
    min-height: 2em;
}